... . The mechanical suspension with 12 -17 PCS leaf spring.There are include 2 axles, 3 axles or 4 axles.We can accept ... ,providing all kinds of suspension system and other trailer parts.2, We have automatic stamping machine,multi-stage stamping machine,Welding ... trailer axles assemble,24T-36T single point suspension(bogie) assembly,2-4 axles mechanical suspension assembly,28T cantilever bogie and semi ...